The Ford rough castings of the standard 289 and 289 Hipo were the same with
the same casting part number. The blocks that became HiPo's were then
machined different for the larger four bolt main caps.
The standard 289 and 289 Hipo cranks were also the same casting. Hipo
Cranks were selected for hardness based on a single Brinell test.
There will be a visible indentation on the crank indicating that the
crank was tested. This does not mean that it was actually a Hipo crank since
the cranks that were tested and failed to meet the hardness requirement were
then used in the standard 289 build.
John Logan
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